package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Component
@Aspect
public class AutoFillAspect {
    @Pointcut("execution(* com.sky.mapper.*.*(..)) &&@annotation(com.sky.annotation.AutoFill)")
    public void AutoFillPointCut() {

    }

    @Before("AutoFillPointCut()")
    public void AutoFill(JoinPoint joinPoint) throws Exception {
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        AutoFill annotation = signature.getMethod().getAnnotation(AutoFill.class);
        OperationType operationType = annotation.value();
//        得到数据库操作的数据类型 insert update
        Object[] args = joinPoint.getArgs();
//        约定参数第一个为实体对象
        if (args[0] == null && args.length == 0) {
            return;
        }
        Object entity = args[0];
//        找到属性
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
//       根据不同类型 给对应属性赋值
        if (operationType == OperationType.INSERT) {
            //为4个公共字段赋值
            try {
                //通过方法名和参数类型获取定义好的方法：setCreateTime
                Method setCreateTime = entity.getClass().getDeclaredMethod(
                        AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(
                        AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(
                        AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(
                        AutoFillConstant.SET_UPDATE_USER, Long.class);

                //通过反射为对象属性赋值
                setCreateTime.invoke(entity, now);
                setCreateUser.invoke(entity, currentId);
                setUpdateTime.invoke(entity, now);
                setUpdateUser.invoke(entity, currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }
        } else if (operationType == OperationType.UPDATE) {
            //为2个公共字段赋值
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(
                        AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(
                        AutoFillConstant.SET_UPDATE_USER, Long.class);

                //通过反射为对象属性赋值
                setUpdateTime.invoke(entity, now);
                setUpdateUser.invoke(entity, currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}

